NASA's Voyager probes

Associated Press
This artists rendering provided by NASA shows the Voyager spacecraft. Thirty-five years after leaving Earth, Voyager 1 is reaching for the stars. Sooner or later, the workhorse spacecraft will bid adieu to the solar system and enter a new realm of space _ the first time a man-made object will have escaped to the other side. (AP Photo/NASA)

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Nasa's Voyager 1 spacecraft and its sister probe Voyager 2 have been traveling through space since 1977. Voyager 1 — the farthest-flung object created by human hands — has left the solar system forever, a study suggests.

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